Cooling means for photographic film tanks



May 1o, 1932. 1,857,134

COOLING MEANS FOR PHQTOGRAPHIC FILI TANKS E. S. BOYNTON Filed April 14.1930 Patented May 10, 1932 UNITED STATES vpifrlzla'l OFFICE.

EARL STANDISH BOYNTON, OF EAST" ORANGE, NEW .TIERSEY,.ASSI(E1NO1`\'1.0`PHOTO-v MATON, INC., OF NEW YORK, N. Y., A CORPORATION F 'NEW YORKCOOLING MEANS FOR PHOTOGRAPIC FILM TANKS `AppHcation led April 14, 1930.Serial No. 444,066.

The object of the present invention is to provide means for maintainingthe chemicals of a plurality of tanks in an automatic developing deviceat a desired temperature be- L6 low that of the surrounding area, theinvention being particularly applicable to the developing apparatus forphotographicV lm strips, forming the subject of A. M. Josepho Patent No.1,656,522 of January 17, 1928.

.10 The principle of the cooling means is the application of a singlecooling medium simultaneously to a plurality of developing tanks throughthe intermediary of heat-transmission plates, or a single plate, whereby1t 1s unnecessary to obstruct the individual developing tanks as byplacing therein cooling tubes for the flow of a refrigerating medium asheretofore proposed.

The invention will be understood by reference to the accompanyingdrawings, in which- F ig. 1 is a view in elevation of a developingapparatus easing supporting a plurality of individual tanks or chambers,and showing applied thereto cooling means constructed in accordance withthe invention, said means being partly broken away,

Fig. 2 is a plan view of the same;

Fig. 3 is a transverse section on the line 3 3, Fig. 1, looking in thedirection lof the arrows, and y Fig. 4 is an enlargedview of the lowercorner of the cooling means shown iny Fig. 3 to illustrate theliquid-tight connections of the cooling means with the photographic lmtank-casing.

In a certain type of developing apparatus for photographic lm strips,such as that disclosed in the aforesaid Patent No. 1,656,522,

a plurality of vertically disposed tanks are employed for containingvarious chemical solutions and washing medium for the strips as theypass from one end of the developing apparatus to the other.

In Figure 1 the vertically extending division walls of the tanks areindicated by the dotted lines l, said walls'being indicated in fulllines by the same numeral in Figure 2. Inasmuch as a plurality of thetanks contain chemicals, their casing and division walls within Vthetanks.

must be constructed of acid resisting material such as'k hard rubber,and owingwto the necessity for condensing the structure to small'compass, particularly as to thelength of the tank, there beingsometimes' as many "f as nine'tanks or chambers,'each containingconveying mechanism for the strip, it has been `disadvantageous toplacecooling means, such as conveyor tubes for afrefrigerant,

The presentl invention avoids the necessity for such cooling tubes bythe application to thetank casing 2 ofva cooling box 8., having heattransmission means p, 1n commumcatlon with those tanks whlchrel quirecooling.k In the present instance 'coolmgbox 3 is formed as a member 1separate fromthe tank casing wall2, and therefore itis formed with alower flange 4 and side flanges 5. Intermediate the flanges and the y icasing wall 2 there is placed a suitable packing, and the flanges arethen# bolted `to the casing/wall by meansof the bolts 6.l

Any other suitable means'for securing the coolingbox inposition may beemployed,

' and if desired the box may be kformed inte-l grally with wall 2. Inthe present instance the tanks indicated at a, b, 0, d and e are thosewhich hold, of the series, chemical solutions for treatment of thestrip, intermediate tanks such as f, g, h, i being washing tanks. Thecasing wall 2 opposite tank d has been' cut away in rectangular form,within cooling box Y 3, to form an aperture 7, Figure 3. This apertureintermediate the tank al and the. cooling box is closed by a plate 8 ofstainless steel or other material capable of heat con* duction butimpervious to the chemical used in the tank. Plate 8 is larger thanaperture 7 so that it has a portion which lies upon the. casing wallsurrounding the aperture, the

plate being held in place by a plurality of bolts 9,v suitable packingbeing placed intermediate the plate and the casing wall 2.`

A similar plate l0 is applied to an aperture 11 in the casing wall 2opposite tank c and a plate 12 is similarly disposed with respect to anaperture-opposite tank e. A fourth plate 13 covers apertures formed inthe casing wall 2` opposite both tanks a and b.- Ink Y the lpresentinstance the section of the coolseA ing box opposite tank e is ofrelatively small area. The cooling box may contain the heat absorptioncoils of a refrigerating machine and may receive brine or any othercooling medium.

In the operation of the device, heat Within tanks a, b, a, d and e` Willbe exchanged by the plates 8, 10, l2 and 13 to the brine orV othercooling medium and the desired temperature i0 within each tank may b emaintained by proportioning the corolin'g'box 3 and the heat y exchangeplates to thearea of the tanks.

By the above meansr coolingfof the photographic chemical solutions isobtained Without the necessity of obstructing the tanks by cooling pipesand the like for the flow of a refrigerating medium. When the coolingbox is a unit independent of the tank casing, Y it Vmay be' providedwith supporting means other than or in addition to the bolts 6, asfor fexample the vertical support 14: shown in Figure 3. y

Having described my invention what I claim and desire to secure byLetters Patent l is as follows;

In combination With a plurality of photographic-'Iilm treating tanksarranged side by side, coolingmeans comprising a cooling ,box adapted'to receive a liquid cooling mel dium, apertures formed in the Walls of aplurality of said tanks, said apertures being in register *Withl thecooling box, and a plurality of heat-exchange plates connected to themarginal Walls of the apertures and separating the said tanks fromthe'cooling box.

In testimony whereof I have signed my name to this specification.

y v,EARL sTANDisH BoYNToN.

